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/*
* Copyright 2012-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.autoconfigure.condition;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.BeanDefinitionStoreException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.beans.factory.CannotLoadBeanClassException;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.SmartInitializingSingleton;
import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.core.ResolvableType;
import org.springframework.core.type.MethodMetadata;
import org.springframework.core.type.StandardMethodMetadata;
import org.springframework.util.ClassUtils;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.StringUtils;
/**
* A registry of the bean types that are contained in a {@link ListableBeanFactory}.
* Provides similar functionality to
* {@link ListableBeanFactory#getBeanNamesForType(Class, boolean, boolean)} but is
* optimized for use by {@link OnBeanCondition} based on the following assumptions:
*
*
Bean definitions will not change type.
*
Beans definitions will not be removed.
*
Beans will not be created in parallel.
*
*
* @author Phillip Webb
* @author Andy Wilkinson
* @since 1.2.0
*/
abstract class BeanTypeRegistry {
private static final Log logger = LogFactory.getLog(BeanTypeRegistry.class);
static final String FACTORY_BEAN_OBJECT_TYPE = "factoryBeanObjectType";
/**
* Return the names of beans matching the given type (including subclasses), judging
* from either bean definitions or the value of {@code getObjectType} in the case of
* FactoryBeans. Will include singletons but not cause early bean initialization.
* @param type the class or interface to match (must not be {@code null})
* @return the names of beans (or objects created by FactoryBeans) matching the given
* object type (including subclasses), or an empty set if none
*/
public abstract Set getNamesForType(Class type);
/**
* Attempt to guess the type that a {@link FactoryBean} will return based on the
* generics in its method signature.
* @param beanFactory the source bean factory
* @param definition the bean definition
* @param name the name of the bean
* @return the generic type of the {@link FactoryBean} or {@code null}
*/
protected final Class getFactoryBeanGeneric(
ConfigurableListableBeanFactory beanFactory, BeanDefinition definition,
String name) {
try {
return doGetFactoryBeanGeneric(beanFactory, definition, name);
}
catch (Exception ex) {
return null;
}
}
private Class doGetFactoryBeanGeneric(ConfigurableListableBeanFactory beanFactory,
BeanDefinition definition, String name)
throws Exception, ClassNotFoundException, LinkageError {
if (StringUtils.hasLength(definition.getFactoryBeanName())
&& StringUtils.hasLength(definition.getFactoryMethodName())) {
return getConfigurationClassFactoryBeanGeneric(beanFactory, definition, name);
}
if (StringUtils.hasLength(definition.getBeanClassName())) {
return getDirectFactoryBeanGeneric(beanFactory, definition, name);
}
return null;
}
private Class getConfigurationClassFactoryBeanGeneric(
ConfigurableListableBeanFactory beanFactory, BeanDefinition definition,
String name) throws Exception {
Method method = getFactoryMethod(beanFactory, definition);
Class generic = ResolvableType.forMethodReturnType(method)
.as(FactoryBean.class).resolveGeneric();
if ((generic == null || generic.equals(Object.class))
&& definition.hasAttribute(FACTORY_BEAN_OBJECT_TYPE)) {
generic = getTypeFromAttribute(
definition.getAttribute(FACTORY_BEAN_OBJECT_TYPE));
}
return generic;
}
private Method getFactoryMethod(ConfigurableListableBeanFactory beanFactory,
BeanDefinition definition) throws Exception {
if (definition instanceof AnnotatedBeanDefinition) {
MethodMetadata factoryMethodMetadata = ((AnnotatedBeanDefinition) definition)
.getFactoryMethodMetadata();
if (factoryMethodMetadata instanceof StandardMethodMetadata) {
return ((StandardMethodMetadata) factoryMethodMetadata)
.getIntrospectedMethod();
}
}
BeanDefinition factoryDefinition = beanFactory
.getBeanDefinition(definition.getFactoryBeanName());
Class factoryClass = ClassUtils.forName(factoryDefinition.getBeanClassName(),
beanFactory.getBeanClassLoader());
return ReflectionUtils.findMethod(factoryClass,
definition.getFactoryMethodName());
}
private Class getDirectFactoryBeanGeneric(
ConfigurableListableBeanFactory beanFactory, BeanDefinition definition,
String name) throws ClassNotFoundException, LinkageError {
Class factoryBeanClass = ClassUtils.forName(definition.getBeanClassName(),
beanFactory.getBeanClassLoader());
Class generic = ResolvableType.forClass(factoryBeanClass).as(FactoryBean.class)
.resolveGeneric();
if ((generic == null || generic.equals(Object.class))
&& definition.hasAttribute(FACTORY_BEAN_OBJECT_TYPE)) {
generic = getTypeFromAttribute(
definition.getAttribute(FACTORY_BEAN_OBJECT_TYPE));
}
return generic;
}
private Class getTypeFromAttribute(Object attribute)
throws ClassNotFoundException, LinkageError {
if (attribute instanceof Class) {
return (Class) attribute;
}
if (attribute instanceof String) {
return ClassUtils.forName((String) attribute, null);
}
return null;
}
/**
* Factory method to get the {@link BeanTypeRegistry} for a given {@link BeanFactory}.
* @param beanFactory the source bean factory
* @return the {@link BeanTypeRegistry} for the given bean factory
*/
public static BeanTypeRegistry get(ListableBeanFactory beanFactory) {
if (beanFactory instanceof DefaultListableBeanFactory) {
DefaultListableBeanFactory listableBeanFactory = (DefaultListableBeanFactory) beanFactory;
if (listableBeanFactory.isAllowEagerClassLoading()) {
return OptimizedBeanTypeRegistry.getFromFactory(listableBeanFactory);
}
}
return new DefaultBeanTypeRegistry(beanFactory);
}
/**
* Default (non-optimized) {@link BeanTypeRegistry} implementation.
*/
static class DefaultBeanTypeRegistry extends BeanTypeRegistry {
private final ListableBeanFactory beanFactory;
DefaultBeanTypeRegistry(ListableBeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
@Override
public Set getNamesForType(Class type) {
Set result = new LinkedHashSet();
result.addAll(Arrays
.asList(this.beanFactory.getBeanNamesForType(type, true, false)));
if (this.beanFactory instanceof ConfigurableListableBeanFactory) {
collectBeanNamesForTypeFromFactoryBeans(result,
(ConfigurableListableBeanFactory) this.beanFactory, type);
}
return result;
}
private void collectBeanNamesForTypeFromFactoryBeans(Set result,
ConfigurableListableBeanFactory beanFactory, Class type) {
String[] names = beanFactory.getBeanNamesForType(FactoryBean.class, true,
false);
for (String name : names) {
name = BeanFactoryUtils.transformedBeanName(name);
BeanDefinition beanDefinition = beanFactory.getBeanDefinition(name);
Class generic = getFactoryBeanGeneric(beanFactory, beanDefinition,
name);
if (generic != null && ClassUtils.isAssignable(type, generic)) {
result.add(name);
}
}
}
}
/**
* {@link BeanTypeRegistry} optimized for {@link DefaultListableBeanFactory}
* implementations that allow eager class loading.
*/
static class OptimizedBeanTypeRegistry extends BeanTypeRegistry
implements SmartInitializingSingleton {
private static final String BEAN_NAME = BeanTypeRegistry.class.getName();
private final DefaultListableBeanFactory beanFactory;
private final Map> beanTypes = new HashMap>();
private int lastBeanDefinitionCount = 0;
OptimizedBeanTypeRegistry(DefaultListableBeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
@Override
public void afterSingletonsInstantiated() {
// We're done at this point, free up some memory
this.beanTypes.clear();
this.lastBeanDefinitionCount = 0;
}
@Override
public Set getNamesForType(Class type) {
if (this.lastBeanDefinitionCount != this.beanFactory
.getBeanDefinitionCount()) {
Iterator names = this.beanFactory.getBeanNamesIterator();
while (names.hasNext()) {
String name = names.next();
if (!this.beanTypes.containsKey(name)) {
addBeanType(name);
}
}
this.lastBeanDefinitionCount = this.beanFactory.getBeanDefinitionCount();
}
Set matches = new LinkedHashSet();
for (Map.Entry> entry : this.beanTypes.entrySet()) {
if (entry.getValue() != null && type.isAssignableFrom(entry.getValue())) {
matches.add(entry.getKey());
}
}
return matches;
}
private void addBeanType(String name) {
if (this.beanFactory.containsSingleton(name)) {
this.beanTypes.put(name, this.beanFactory.getType(name));
}
else if (!this.beanFactory.isAlias(name)) {
addBeanTypeForNonAliasDefinition(name);
}
}
private void addBeanTypeForNonAliasDefinition(String name) {
try {
String factoryName = BeanFactory.FACTORY_BEAN_PREFIX + name;
RootBeanDefinition beanDefinition = (RootBeanDefinition) this.beanFactory
.getMergedBeanDefinition(name);
if (!beanDefinition.isAbstract()
&& !requiresEagerInit(beanDefinition.getFactoryBeanName())) {
if (this.beanFactory.isFactoryBean(factoryName)) {
Class factoryBeanGeneric = getFactoryBeanGeneric(
this.beanFactory, beanDefinition, name);
this.beanTypes.put(name, factoryBeanGeneric);
this.beanTypes.put(factoryName,
this.beanFactory.getType(factoryName));
}
else {
this.beanTypes.put(name, this.beanFactory.getType(name));
}
}
}
catch (CannotLoadBeanClassException ex) {
// Probably contains a placeholder
logIgnoredError("bean class loading failure for bean", name, ex);
}
catch (BeanDefinitionStoreException ex) {
// Probably contains a placeholder
logIgnoredError("unresolvable metadata in bean definition", name, ex);
}
}
private void logIgnoredError(String message, String name, Exception ex) {
if (BeanTypeRegistry.logger.isDebugEnabled()) {
BeanTypeRegistry.logger.debug("Ignoring " + message + " '" + name + "'",
ex);
}
}
private boolean requiresEagerInit(String factoryBeanName) {
return (factoryBeanName != null
&& this.beanFactory.isFactoryBean(factoryBeanName)
&& !this.beanFactory.containsSingleton(factoryBeanName));
}
/**
* Returns the {@link OptimizedBeanTypeRegistry} for the given bean factory.
* @param factory the source {@link BeanFactory}
* @return the {@link OptimizedBeanTypeRegistry}
*/
public static OptimizedBeanTypeRegistry getFromFactory(
DefaultListableBeanFactory factory) {
if (!factory.containsLocalBean(BEAN_NAME)) {
BeanDefinition bd = new RootBeanDefinition(
OptimizedBeanTypeRegistry.class);
bd.getConstructorArgumentValues().addIndexedArgumentValue(0, factory);
factory.registerBeanDefinition(BEAN_NAME, bd);
}
return factory.getBean(BEAN_NAME, OptimizedBeanTypeRegistry.class);
}
}
}
